I am guessing your new PC has Windows Vista.
Although Lexmark doesn't have Vista drivers available for that model, people have had success using Windows 2000 drivers with many older Lexmark printers.
It may work, or it may not. The only other option is to wait for Lexmark to release the Vista driver. They are always adding Vista drivers for the older models.
You can download the Windows 2000 driver here:
http://downloads.lexmark.com/cgi-perl/downloads.cgi?lxkprod=Lexmark+Photo+P3150
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